torture: fix whitespace/tab mixup in internal_torture_run_test()

No diff visible with "git show|diff -w".

Signed-off-by: Michael Adam <obnox@samba.org>
Reviewed-by: Martin Schwenke <martin@meltin.net>

Autobuild-User(master): Martin Schwenke <martins@samba.org>
Autobuild-Date(master): Mon Sep  8 04:21:52 CEST 2014 on sn-devel-104